• Bodily injury liability: Covers injury and death claims against you, and legal costs, if your car injures or kills someone.

• Property damage liability: Covers claims for property that your car damages in an accident. Because liability coverage protects the other party, it is required in all but three states.

• Medical payments: Pays for injuries to yourself and to occupants of your car. This is optional in some states. In "no-fault" states, personal injury protection replaces medical payments as part of the basic coverage.

• Uninsured motorist protection: Covers injuries caused to you or the occupants of your car by uninsured or hit-and-run drivers. "Under-insured" coverage also is available, to cover claims you may make against a driver who has inadequate insurance. In some states, as many as 30 percent of drivers are uninsured.

• Collision coverage: Covers damage to your car up to its book value. Collision coverage carries a deductible, which is the amount per claim you have to pay before the insurance takes effect. The lower the deductible, the higher the premium. While it is legally optional, a lending institution or leasing company usually requires collision coverage.

• Comprehensive (physical damage): Covers damage to your car from theft, vandalism, fire, wind, flood, and other non-accident causes. Comprehensive also carries a deductible.

2. Your Vehicle Affects Your Premium

4. Decide How Much Coverage You Need

While it is dangerous to be underinsured, having too much insurance can be an expensive mistake as well. Without insurance, your property is put at risk in an accident that is your fault. The minimum amount of insurance required in your state is seldom enough.

State law may require as little liability coverage as $15,000 per person, $30,000 per accident, and $5000 property damage. About half of the states require $25,000 per person and $50,000 per accident. Half of them require $10,000 in property damage coverage. If you can afford it, buy more than the minimum. After all, $10,000 for property damage may not be enough if you hit a $100,000 Mercedes-Benz.

The more assets and income you have, the more insurance you need. Most insurers recommend liability coverage of at least $100,000 per person, $300,000 per accident, and $50,000 property damage if you have assets to protect, such as a house. Some insurers also recommend a $1 million "personal liability umbrella" policy issued in conjunction with homeowner's coverage. State Farm reports that such coverage averages $270 a year, but the amount varies significantly depending on location and other factors. An "umbrella" policy could protect a family from financial ruin in a major lawsuit.

Like buying a car, there is no single best solution when it comes to buying insurance. Rates vary widely. Surveys suggest that you could pay anywhere from $500 to $2000 annually for the same coverage from different companies. Shop for insurance by consulting two or three of the largest insurers, such as State Farm and Allstate. Then, contact one or two independent agents who can quote premiums from more than one company. In addition, there are direct-marketing companies, such as GEICO and Progressive, which do business over the phone rather than through agents and offer some of the lowest rates. Ask for an itemized list of coverages and costs.

"We're price-competitive," said spokesperson Dick Luedke of State Farm, whose rates dropped somewhat during 2004. But with so many factors involved in setting rates, it's wise to check several prospects.

In 2004, the average price of auto insurance nationwide was $871, according to the Insurance Information Institute. They expected that the cost of auto insurance would rise by 3.5 percent in 2004, which would be the smallest increase in four years.

Don't forget the Internet. Many companies now offer online quotes, and insurance shopping on the Web allows you to compare rates from multiple providers in the comfort of your own home.

• Most companies give a break to those who drive less than 7500 miles a year. If you take public transportation instead of driving to work, your premium will go down. Out of the question? Try carpooling.

• Make sure you get all the discounts you are entitled to. You might qualify if your vehicle has an alarm, for example. Discounts used to be given for such safety features as airbags, but they're fading away as those items become more commonplace. Discounts might also be available if you insure your vehicles and your home with the same company. People who pass a defensive-driving course or don't smoke or drink often get discounts.

• Review the status of all the drivers in your family with your agent. Most discounts apply only to one portion of the policy, so don't expect dramatic savings.

• Increase your deductible for collision and comprehensive. Switching from a $100 deductible to $1000 can reduce the collision portion of your premium by 30 percent, said Luedke. You'll still be covered for catastrophes, but you foot the bill for fender-benders. Also, think twice about filing small claims with your insurance: Why risk a premium increase?

• Shop around. Instead of just renewing, study the fine print of your policy to see if its terms -- or your situation -- have changed. Another company might have better rates, but you won't know unless you shop. Most insurers give rates over the phone and many via online computer services, making it easy to compare premiums.

• Drop collision coverage on older cars. Claims are limited to "book" value, so you're not likely to get much anyway if you car is more than seven years old. A good rule of thumb is to drop collision when the annual premium reaches 10 percent of your car's value.

• Be a good driver. Avoid accidents and traffic violations and you will be rewarded with good-driver discounts. Bad driving is expensive. The "safer you can be" on the road, Luedke said, "the lower your premiums."

• Drop coverage for such extras as towing costs or the expense of renting a car while yours is in the shop. The savings are probably small, but your new-car warranty's roadside assistance provision may provide them at no cost.

• Have your teenager share the family car instead of owning his or her own. Be sure to tell your agent if your son or daughter makes the honor roll or moves away to college. Both qualify for discounts with most companies.

• If your group health insurance provides generous coverage, consider dropping the medical-payments portion of your policy.

• Keep your credit rating healthy. A growing number of insurers are considering a person's credit score when setting rates.